| Next prime | 89 |
| Previous prime | 79 |
| Octal | (123)8 |
| Hexadecimal | (53)16 |
| Prime gap | 6 |
| 15th Sexy prime (the small number) | The big number is 89 . |
| 13th Prime of the Form 4n+3 | |
| 7th Euler prime number | |
| 9th Sophie Germain prime | |
| 7th Safe prime | |
| 14th Left-truncatable prime |